Sheet registering mechanism



Dec. 13, 1955 ALBRECHT 2,726,863

SHEET REGISTERING MECHANISM Filed Aug. 22. 1950 2 Sheets-Sheet l //1VAT/V7 0/9.

Dec. 13, 1955 A. J. ALBRECHT 2,726,863

SHEET REGISTERING MECHANISM Filed Aug. 22, 1950 2 Sheets-Sheet 2 I I a\l/ j ig-M w Alexander J. Albrecht, West United States Patent'G SHEETREGISTERING MECHANISM New York, N. J., assignor .to R. Hoe & Co. Inc.,New York, N. Y., a corporation of New York Application August 22, 1950,Serial No. 180,786

4 Claims. (Cl. 271-56) This invention relates to improvements in sheetregistering mechanism.

The general object of the invention is to provide improved means forstripping a mis-registered sheet from a registering cylinder.

With this, as well as other objects, which will appear in the followingdescription, in mind, a preferred embodiment of the invention will nowfirst be described with reference to the accompanying drawing and thefeatures forming the invention will then be pointed out in the appendedclaims.

In the drawing, Figure 1 is a cross-section of a registering cylinder,with stripping mechanism according to the invention, and Figures 2 and 3are similar views showing the parts in difierent operating positions.Fig. l-A is a detail view showing the actuating mechanism for the sheetstripping mechanism.

In Albrecht application Serial No. 102,682, filed July 1, 1949, forSheet Registering Mechanism (now Patent No. 2,642,283, issued June 16,1953), there is disclosed a registering cylinder in which the detectingmechanism actuates a number of sheet ejector rods which lift the leadingedge of a mis-registered sheet from the cylinder surface just prior tothe time when the grippers, or sheet taking elements, close to take thesheet. This eliminates the need for gripper opening and strippermechanisms, such as shown in Huck Patent 2,231,914, for removing amis-registered sheet from the grippers, but it has been found preferableto forcibly remove a this-registered sheet from the cylinder and directit away from running parts of the machine. The present inventionprovides additional mechanism, useable with the registering cylinder ofthe said application, and comprises stripper rollers swingable into andout of operative relation to the cylinder, together with operatingmechanism controlled by the detector shaft of the cylinder.

In the drawings, there is shown only so much of the structure of theabove mentioned application as is necessary to an understanding of thepresent invention. The cylinder 1 is journalled by means of its shaft 2in frames, part of one of which is indicated schematically at 3, and isdriven in time relation to the sheet supplying and sheet takingmechanisms, as usual, a sheet S being fed to the cylinder at the properpoint in each rotation. Driven tapes 4 hold the sheet S on the cylinderand urge it forward against front stops 5. The detector shaft 6 carriesa cam follower 7, cooperating with a cam 8 rotating counterclockwise asindicated. Ejector rods 9 serve to lift the front edge of amis-registered sheet to prevent it being taken by the sheet forwardinggrippers 10. The operating cycle, as more fully described in the abovementioned application, involves two alternatives, depending on whetherthe detector mechanism finds the sheet to be properly registered or not.First, if a sheet is properly registered: the detector shaft 6 will rockclockwise as the cylinder rotates slightly past the position of Figure1; the plungers 9 will remain in the retracted position of Figure 1; andthe grippers 10 will close and take the sheet. The grippers 10 arecarried on a gripper bar 10 of the type shown in Patent 2,642,283, abovereferred to, which gripper bar is temporarily supported in the positionshown in the cylinder, on rollers 10 As indicated in the said patent,the gripper bar is also connected to conveyor chains (not shown herein)which bring it to and take it away from the location of the cylinder asshown, at appropriate pointsin the operating cycle of the mechanism. Thespecific manner of moving the gripper bar to and from the cylinder isnot involved in the present invention, which is concerned with .theoperation .of the grippers 10 and with whether or not they takea sheet Sin position on the cylinder, which action, if it occurs, is accomplishedby the gripping of the forward end of the sheet by the grippers, so thatthey have control of the sheet. Second, if the sheet is mis-registered:detector shaft .6 will remain in the position of Figure l; ejector rods9 will be forced out as indicated in Figure 2, lifting the leading edgeof the sheet away from the grippers 10; and the grippers will close butwill not take the sheet. The shaft 6 is operated to control thestripping mechanism in the manner now to be explained.

A plurality of short stripper rollers 11 are spaced along and secured ona shaft 12 rotatably carried by arms 13 which swing freely on a shaft 14that is rotatably supported in the frames 3 and drives a roller 15 whichis secured thereto. The shaft 12 is driven by gearing (not shown) fromthe shaft 14, which in turn is driven preferably by other gearing (notshown) from the cylinder 1. The stripper rollers 11 coact with theroller 15 carrying the tapes 4 and are driven counterclockwise asindicated. The shaft 12 is swung about the shaft'14 by a cam followerarm 16 attached to an arm 13 and cooperating with a cam 17 rotating withthe cylinder 1. The arm 16 extends upwardly above the shaft 14 and isconnected to a poppet spring mechanism 18 mounted on the frame 3 andwhich tends to swing the arm 16 counterclockwise. Latch bar 20, pivotedon frame 3 at 21, hooks over latch pin 22 on the arm 16. A poppet spring23 attached to frame 3 urges the latch bar down into the latchingposition of Figure 1.

An arm 24 fixed to detector shaft 6 carries a roller 25 for engaging thelatch bar 20 and for lifting the same to bring the stripper mechanisminto operation.

If a sheet S is properly registered, the shaft 6 rocks clockwise,dropping arm 24 and roller 25 so that latch bar 20 is not engaged by theroller. -In consequence, the stripper rollers 11 are held away from thecylinder 1 and do not operate.

If, however, a sheet is mis-registered, shaft 6 and arm 24 remain in theposition of Figure 1 and as the cylinder rotates roller 25 engages latchbar 20 and lifts it as shown in Figure 2. Meanwhile ejector rods 9 willhave lifted the leading edge of the sheet as shown in Figure 2, so thatwhen the grippers 10 close they will not take the sheet. The mechanismby which the movement of detector shaft 6 controls the movement of theplungers 9 is fully shown and described in Patent 2,642,283, abovereferred to. It comprises a member 6 carried by the detector shaft 6 andpositioned when the shaft 6 is in its counterclockwise position(follower roller on the high of cam 8 as shown in Fig. 1) so as topermit movement of the rods 9 by the mechanism shown in Fig. l-A at theappropriate time as determined by a second cam 6 If the cam follower 7does not drop (as occurs if a sheet is to be rejected) the toe 6 will bein a higher position than that shown in Fig. l-A and will preventejection of the rods 9, by blocking movement of toe 6 As soon as the lowof the cam 17 comes under the follower arm 16, the arm will rotatecounterclockwise to the position shown in Figure 3. This brings thestripper rollers 11 against the sheet and wipes the leading edge of thesheet back on the cylinder, giving it a huckle fold between the rollers11 and 15, thus removing the sheet from the machine.

What is claimed is:

,1. In a sheet registering mechanism having a register ing cylinder,sheetdetecting and sheet rejecting means, the combination with thecylinder of stripping rollers movaregistered sheet on the cylinder.

2 .2. In a sheet registering mechanism having a registering cylinder,sheet detecting and sheet rejecting means, the:combination with thecylinder of stripping rollers movable into stripping engagement with theouter sur- 7 face of a sheet on the cylinder and actuating meanstheretor, comprising a spring for urging the rollers toward the cylinderand a cam rotatable with the cylinder for controlling the movement oftherollers toward and away :from the cylinder, a latch for holding therollers away fromthe cylinder and means controlled by the sheetdetecting means for releasing the latch to permit the stripping rollersto move into stripping engagement with a misregistered sheet on thecylinder.

3; In a sheet registering mechanism having a registering cylinder, sheetdetecting means, and grippers for taking a sheet from the cylinder, thecombination with the cylinder of means actuated by the detectingmeansfor lifting the leading edge of a sheet to prevent the grippersfrom gripping it, stripping rollersrnovable into stripping engagementwith the outersurface of a sheet on the cylinder, and actuating meanstherefor controlled by the sheet detecting means for bringing thestripping rollers into stripping engagement when a mis-registered sheetis on the cylinder.

4. In a sheet registering mechanism having a register,- ing cylinder,sheet detecting means, and grippers for taking a sheet from thecylinder, the combination with the cylinder of means actuated by thedetecting means for lifting the leading edge of a sheet to prevent thegrippers from gripping it, stripping means operable to strip a sheet oilthe cylinder, and actuating means for the stripping means actuated bythe sheet detecting means when a mis registered sheet is on thecylinder. 1

References Cited in the file of this patent V UNITED STATES PATENTS HuckFeb; 18,

